[R] marginal structural modeling

[John Sorkin]

Does anyone know an R package that implements marginal structural modeling as described by Jamie Robins? A similar question was asked of the list approximately two-years ago and it does not appear that anyone responded. 
Thanks,
John Sorkin 
 John David Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology
Baltimore VA Medical Center
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